____ are arranged in energy levels (shells) around the ____ of an atom. The lowest energy level is the one closest to the nucleus. The first shell can hold a maximum of ____ electrons, the second and third shells can hold a maximum of ____ electrons. Elements are arranged in order of ____ number in the Periodic Table. The ____ number of an element tells us how many outer electrons it has. Elements in the same group have the same number of outer electrons and therefore have similar ____ properties. As you go down each element in a group, there is one ____ shell.

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